Climate change is a fact. We have to face its consequences. So, adaptation is a must. Availability of land resources and population pressure on land dictates us for adoption of conservation regimes or preservation of representative habitats/noble habitats. It is better to preserve unique habitats- let it grows with time.

Well, I hope I have understood the real meaning of the question. I think in the case of various climate change scenarios (I do believe that we should still perceive climate change as a scenario) the most important thing is to be prepared for some unpredictable effects of this scenarios. Consequently, in order to cover (to be prepared for) a wider range of possible effects and to minimize the negative effects on ecosystems it is mandatory to prepare a larger and more diverse collection of representative habitats.

Yes, it is very important to preserve as many diverse types of ecosystems as possible in this era of Global Warming. We should realize that nearly all these ecosystems will be undergoing stress and some degree of change, some more some less. It is important to allow these to adapt to the global changes, for example allowing for migrations to higher altitudes or latitudes by colder-climate-adapted organisms and their ecological communities. This depends to a large degree on what we people are willing to do in the way of accommodating these diverse ecosystems, how we ourselves are willing to make sacrifices so that these may continue to live and thrive. In the end, so doing will permit our very own survival.